The Fermi Paradox and the Aurora Effect: Exo-civilization Settlement, Expansion, and Steady States

@article{CarrollNellenback2019TheFP,
  title={The Fermi Paradox and the Aurora Effect: Exo-civilization Settlement, Expansion, and Steady States},
  author={Jonathan J. Carroll-Nellenback and Adam Frank and Jason T. Wright and Caleb A. Scharf},
  journal={The Astronomical Journal},
  year={2019},
  volume={158}
}
We model the settlement of the Galaxy by space-faring civilizations in order to address issues related to the Fermi Paradox. We are motivated to explore the problem in a way that avoids assumptions about the agency (i.e., questions of intent and motivation) of any exo-civilization seeking to settle other planetary systems. We begin by considering the speed of an advancing settlement front to determine if the Galaxy can become inhabited with space-faring civilizations on timescales shorter than… 

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References

SHOWING 1-10 OF 40 REFERENCES

Galactic civilizations - Population dynamics and interstellar diffusion

THE Ĝ INFRARED SEARCH FOR EXTRATERRESTRIAL CIVILIZATIONS WITH LARGE ENERGY SUPPLIES. I. BACKGROUND AND JUSTIFICATION

It is found that the maximum Galaxy colonization timescale is actually much shorter than previous work has found, and that many "sustainability" counter-arguments to Hart's thesis suffer from the monocultural fallacy.

Searching for Extraterrestrial Civilizations

It is argued that planning for a search for extraterrestrial intelligence should involve a minimum number of assumptions and that the galaxy is either essentially empty with respect to technological civilizations or extensively colonized, and a SETI would be unproductive.

THE Ĝ INFRARED SEARCH FOR EXTRATERRESTRIAL CIVILIZATIONS WITH LARGE ENERGY SUPPLIES. II. FRAMEWORK, STRATEGY, AND FIRST RESULT

We describe the framework and strategy of the Ĝ infrared search for extraterrestrial civilizations with large energy supplies, which will use the wide-field infrared surveys of WISE and Spitzer to

Astrobiology: The Study of the Living Universe

Ke yW ords bioastronomy, cosmobiology, exobiology, SETI ■ Abstract Astrobiology is the study of the living universe. Astronomy provides the context for the origin and evolution of life on Earth.

If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life

Given the fact that there are perhaps 400 billion stars in our Galaxy alone, and perhaps 400 billion galaxies in the Universe, it stands to reason that somewhere out there, in the 14-billion-year-old

Light of the Stars: Alien Worlds and the Fate of the Earth

The great American philosopher, poet, educator, and an early eco-activist Ralph Waldo Emerson happened to be in Paris during the tumultuous days of the 1848 liberal revolutions across Europe. Upon

How Much SETI Has Been Done? Finding Needles in the n-dimensional Cosmic Haystack

This article develops the metaphor of the multidimensional "Cosmic Haystack" through which SETI hunts for alien "needles" into a quantitative, eight-dimensional model and performs an analytic integral to compute the fraction of this haystack that several large radio SETI programs have collectively examined.